Earth Rover Program tracks global soil health

With a synchronized tap from run-of-the-mill hammers on metal plates resting on the ground, researchers kneeling in nine fields across four continents believe they’ve hit upon more than just the earth beneath their feet. “Waiting for it,” someone said. And then, “Waveforms!” “Excellent, waveforms!” another said, as the tiles on screen reveal EKG-like sets of […]